SOLUTION: how much liter of alcohol is added to a 4-liter 50% solution to make 70% solution?

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: how much liter of alcohol is added to a 4-liter 50% solution to make 70% solution?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 320654: how much liter of alcohol is added to a 4-liter 50% solution to make 70% solution?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
pure alcohol x liters
50%solution 4 liters
70% solution x+4 liters
..
x+0.5x=0.7(x+4)
1.5x= 0.7x+2.8
0.8x=2.8
x=2.8/0.8
x=3.5 liters of pure alcohol